dasayheykid
Member
- :
- Mazda CX-5, GT
Sorry my dude...welcome to the club. Hoping it is something funky with the startup of the skyactiv engine in cold weather.
rare violent and rough engine starts....
- Thread starter CodyZoom
- Start date
Sorry my dude...welcome to the club. Hoping it is something funky with the startup of the skyactiv engine in cold weather.
I was watching trials of CX-5 engine startup on Japanese TV a while back (I was there during a particularly cold winter, so it was note worthy TV). The change to a higher compression required a change to the way the engine started cold and it seems as if they solved the problem, at least in laboratory conditions.
It is completely unlike any other engine on the market due to the high compression and required a re-think for cold startups.
Japanese have cold enough weather with which to test with, but although the Japanese have very high snowfalls, Japanese temperatures do not drop to the extremes found in the US and Canada.
The Japanese are also lucky in that their massive snowfalls are typically powder due to the Russian wind. It barely feels cold or wet. You could be in the middle of a Japanese snow storm, and the CX-5 would never have the start issues found in the US/Canada.
Japan in winter is far too pleasant despite metres, and metres of snow to cause too much of an issue.
If one is going to test a vehicle, the US and Canada (and possibly Siberia) are perfect for cold weather start tests.
I suspect they would have done many tests in Russia, given the proximity to Japan and Russia eventually producing domestic CX-5's there.
Unfortunately I can't comment where I am. We're getting closer to winter in Australia, but we consider freezing to be about 9C (48F). The coldest I've ever experienced in Sydney is not too far below this. Furthermore, I'll have different cold start issues having a diesel compared to the petrol.
It is completely unlike any other engine on the market due to the high compression and required a re-think for cold startups.
Japanese have cold enough weather with which to test with, but although the Japanese have very high snowfalls, Japanese temperatures do not drop to the extremes found in the US and Canada.
The Japanese are also lucky in that their massive snowfalls are typically powder due to the Russian wind. It barely feels cold or wet. You could be in the middle of a Japanese snow storm, and the CX-5 would never have the start issues found in the US/Canada.
Japan in winter is far too pleasant despite metres, and metres of snow to cause too much of an issue.
If one is going to test a vehicle, the US and Canada (and possibly Siberia) are perfect for cold weather start tests.
I suspect they would have done many tests in Russia, given the proximity to Japan and Russia eventually producing domestic CX-5's there.
Unfortunately I can't comment where I am. We're getting closer to winter in Australia, but we consider freezing to be about 9C (48F). The coldest I've ever experienced in Sydney is not too far below this. Furthermore, I'll have different cold start issues having a diesel compared to the petrol.
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Yep, that's probably what it is. Not convinced it's anything to worry about given than it lasts 2-5 seconds max. I did not notice any violent behavior during the brief cold start stumble.
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Well it doesn't look like there is a real problem since no MIL lights have been set. I'd like to know what is actually going on with the AWS. I wonder if the computer is retarding the engine exhaust timing and ignition timing to send some unburned hot gases to the converters to light them off quicker. (uhm)
VK Sefirosu
Member
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- 2016 CX-5 GT AWD
Haven't experienced any of this yet, but I got my CX-5 late in the colder season and although it snowed back then temperatures never went much below -5C. Since it's not too uncommon to get temperatures in the -20C for weeks here in the winter, I'll guess we'll know next winter how it fares if it is related to cold weather…
Do you guys know if something like this also happens with a Skyactiv Mazda 3 ?
Do you guys know if something like this also happens with a Skyactiv Mazda 3 ?
I think I may have got my engines mixed up. Seems the Diesel had to be changed to allow cold startups.
http://www.mazda.com/mazdaspirit/skyactiv/engine/skyactiv-d.html
There are two main problems that have been preventing the spread of low-compression-ratio diesels regardless of these merits. The first is the fact that when the compression pressure is reduced, the compression temperature during cold operation is too low to cause combustion, preventing engine-start. The second is the occurrence of misfiring during warm-up operation due to lack of compression temperature and pressure.
A single combustion cycle is sufficient for the exhaust gas temperature to rise. Given this, the exhaust valves are opened slightly during the intake stroke to regurgitate the hot exhaust gas back into the cylinder, which increases the air temperature. This promotes the elevation of compression temperature, stabilizing ignition.
The compression of the diesel if an extremely low (for diesel) 14:1 (most seem to be anywhere between 16:1 to 22:1 ratio and are bulky as buggery to copy with that).
The petrol link is:
http://www.mazda.com/mazdaspirit/skyactiv/engine/skyactiv-g.html
http://www.mazda.com/mazdaspirit/skyactiv/engine/skyactiv-d.html
There are two main problems that have been preventing the spread of low-compression-ratio diesels regardless of these merits. The first is the fact that when the compression pressure is reduced, the compression temperature during cold operation is too low to cause combustion, preventing engine-start. The second is the occurrence of misfiring during warm-up operation due to lack of compression temperature and pressure.
A single combustion cycle is sufficient for the exhaust gas temperature to rise. Given this, the exhaust valves are opened slightly during the intake stroke to regurgitate the hot exhaust gas back into the cylinder, which increases the air temperature. This promotes the elevation of compression temperature, stabilizing ignition.
The compression of the diesel if an extremely low (for diesel) 14:1 (most seem to be anywhere between 16:1 to 22:1 ratio and are bulky as buggery to copy with that).
The petrol link is:
http://www.mazda.com/mazdaspirit/skyactiv/engine/skyactiv-g.html
It's mid September here in Washington DC and we've had our first few mornings in the lower 50s (F). I've had a pit in my stomach everytime I've started my CX-5 at 630 am for the past 10 days or so. Sure enough - it did it this morning at approx. 52 degrees F. When I contacted my dealer in Spring about the knocking/misfiring issue, they basically tried to tell me I was retarded and didn't understand that the CX-5's valves open to heat the Cat quicker. I rebutted and they said "bring it in". Well the weather warmed up and it never happened again, till today. I'm going to start videotaping the tachometer at each startup to provide evidence to my dealer. Like other folks have said, there's no light indicating a malfunction from the car's computer, but it makes me cringe everytime it happens. I'm curious if anyone else has had the problem since it's been getting colder.
I have both the 2012 Skyactiv Mazda 3 and the CX-5. I've had the Mazda 3 since April. We have had some mid 40's in the morning while starting the car and I have never had that issue. I only have the normal cold morning start on both the Mazda 3 and the CX-5. I will keep an eye on it as the temps. drop more.
mobius120487
The Stig
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- 2013 Mazda CX-5 Touring AWD
sub...haven't had it happen...yet
Most have never experienced these issues (specifically tranny and rough starts), very rare.
Still TBD on the fix for diesel oil level issue, but that's not just a Mazda Skyactiv issue, other automakers' clean diesels have same problem.
I was having the morning rough start issue to the point that it would backfire 2 or 3 times before smoothing out. I called the dealer and they said there was a re-flash for the computer. I had it done yesterday so we'll see how it goes but i tell the car is differnt now... way smoother driveability and quieter in the morning....so far..
Got the CX back today. The dealership said they couldn't find anything wrong with it. I'll continue to record every start on video until I capture it. Until that point, please report any problems/fixes to this issue! Many thanks.
P.S. Still love my CX-5. Installed roof rails, crossbars and will be receiving the snowboard attachment aftermarket soon. Can't wait to take this bad boy to the slopes, hopefully we need the AWD to get there!
P.S. Still love my CX-5. Installed roof rails, crossbars and will be receiving the snowboard attachment aftermarket soon. Can't wait to take this bad boy to the slopes, hopefully we need the AWD to get there!
After a couple weeks, has the fix eliminated the problem?
